No idea of that mfg., but that style is still the norm in Europe, even
in new construction and hotels. Vertical bar for the shower head to
slide up and down on, and you can pull it off for hand held, etc.
There is a catalog -- "Restorations," or the like that has all that
sort of stuff. Google is your friend.

Check this:

http://www.ub.unibas.ch/wwz/vsa/114-001.htm